Jason Koelewyn, MD
NPI 1659592020 · Family Medicine Physician · Sioux Center, IA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jason Koelewyn, MD is a Family Medicine Physician provider in Sioux Center, IA (NPI 1659592020).
Provider details
- NPI number
- 1659592020
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 37667 (IA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
156 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 72 | $71 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 49 | $76 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 20 | $110 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 15 | $125 |
Typical Medicare-allowed amounts for these services range $71–$125 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 138 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 470 | 93 |
| Levothyroxine Sodium | 308 | 49 |
| Losartan Potassium | 253 | 54 |
| Omeprazole | 247 | 50 |
| Amlodipine Besylate | 218 | 43 |
| Tamsulosin Hcl | 202 | 42 |
| Apixaban |
Practice location
Mailing address
Additional practice locations (1)
- 645 S Main AveSioux Center, IA 51250-1347Phone: (712) 722-2609Fax: (712) 722-4325
Registry dates
- Enumerated
- 2007-05-01
- Last updated
- 2018-03-17
Frequently asked questions
- What is Jason Koelewyn's NPI number?
- Jason Koelewyn's National Provider Identifier (NPI) is 1659592020, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jason Koelewyn's specialty?
- Jason Koelewyn is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Jason Koelewyn located?
- Jason Koelewyn's practice location on file with NPPES is 1101 9th St Se, Sioux Center, IA 51250-2501.
- What is Jason Koelewyn's phone number?
- The practice phone number listed in the NPPES registry for Jason Koelewyn is (712) 722-2609.
- Does Jason Koelewyn accept Medicare?
- Jason Koelewyn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jason Koelewyn's NPI active?
- Yes — Jason Koelewyn's NPI (1659592020) is active in the NPPES registry as of the last update on 2018-03-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.